Ken Scott, the filmmaker behind “Starbuck” and its Hollywood remake, “Delivery Man,” has reunited with Vince Vaughn, the lead from his bland 2013 film, for another project. The idea of the director and star of that comedy teaming up again isn’t exactly enticing, and neither is the final result, because once again, the duo has failed to deliver with “Unfinished Business.”

Vaughn stars as Daniel Trunkman, a salesman who quits his unsatisfying job and goes off to start his own business. What does Trunkman sell for a living? A product so boring that it’s hardly ever mentioned in the film, and when it is, Trunkman only comments on how dull the merchandise is. Trunkman only has two employees, Timothy McWinters (Tom Wilkinson) and Mike Pancake (Dave Franco), an odd but satisfying pairing responsible for most of the film’s scarce laughs. The small company is in serious need of a sale, so when a financially promising opportunity rises, the boss and his employees will stop at nothing to close the potential deal. Their work brings them to Berlin, where they’ll have to compete against Trunkman’s old boss, Charlie (Sienna Miller), for the sale.

While “Unfinished Business” initially looks to be an ensemble comedy, it mostly rests on the shoulders of its biggest star, which is a shame. Vaughn isn’t an actor that pushes himself to new places. He has a comedic persona which he rarely strays from, often playing straight shooters with a motormouth, and that’s the character he plays once again in Scott’s film. Every comic note Vaughn hits is stale and expected. There’s nothing fresh about his style or approach anymore; it’s tired and outdated. As for Wilkinson and Franco, they’re far more energetic and engaged than their co-star.